Electronic watch with time correction system

Details Electronic watch with time correction system Electronic watch with time correction system

G - Physics

04

C

58/0.2

G04C 3/00 (2006.01) G04G 5/02 (2006.01)

Patent

CA 1059324

ABSTRACT OF THE DISCLOSURE An electronic watch wherein pulses from a high- frequency standard are converted by a frequency divider into low-frequency timing pulses which are supplied to a stepping motor to advance the hands of the time display. In order to automatically effect a rapid correction of the seconds hand display when it deviates from precise time, a system is provided that includes an actuating element accessible to the user of the watch and operatively coupled to a switch connected through a reset line to several of the last stages of the frequency divider to effect a reset thereof upon activation of the switch. Also reset when the switch is activated is a reference counter supplied with pulses by the frequency divider. The divider feeds pulses by way of a logic circuit to the stepping motor and to a synchronous counter which is maintained in synchronism with the time display. A com- parator circuit determines whether a deviation exists be- tween the two counters and acts to govern the number of pulses per unit of time that the logic circuit supplies to the stepping motor and to the synchronous counter to an extent correcting for the deviation. The logic circuit is so connected to the outputs of the resettable divider stages that the transmission of pulses from the divider to the two counters can only be carried out during a pulse transfer period whose duration is no longer than the last quarter of the longest duration pulse period of the di- vider. Resetting of the frequency divider is inhibited during the transfer period.

276763

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